Improves fuel efficiency and reduces emissions by optimizing the fuel air mixture for efficient combustion. Easier starting, stabilized idle, and strong power during acceleration. Compatible with Stihl BR500, BR550, BR600 and BR700 blowers; suitable as a replacement carburetor for chainsaws and garden tools. Function: reliably mixes fuel and air to promote smooth operation. Compact design for easy installation; durable construction for outdoor use; standard mounting for straightforward replacement. Use scenarios: - Replacing a worn carburetor on a Stihl BR500 or BR550 blower to restore easy starts and smooth operation. - Replacing on chainsaws or garden tools to improve throttle response and maintain consistent power during cutting or trimming. - Working under load in yard cleanup or brush cutting to keep RPM stable and provide steady acceleration. Compatibility check: confirm model and mounting compatibility before purchasing.